<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="css/my.css">
</head>
<body>

<h1 class="mys1">ok</h1>
<p class="mys1 mys2">aa</p>
<p id="p1">bb</p>
<p class="mys1">cc</p>

</body>
</html>